<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="./css/inputnumber.css" />
    <link rel="stylesheet" href="./css/index.css" />
    <title>购物车</title>
  </head>
  <body>
    <div class="app-container" id="app">
      <!-- 顶部banner -->
      <div class="banner-box"><img src="./img/fruit.jpg" alt="" /></div>
      <!-- 面包屑 -->
      <div class="breadcrumb">
        <span>🏠</span>
        /
        <span>购物车</span>
      </div>
      <!-- 购物车主体 -->
      <div class="main" v-if="fruitList.length>0">
        <div class="table">
          <!-- 头部 -->
          <div class="thead">
            <div class="tr">
              <div class="th">选中</div>
              <div class="th th-pic">图片</div>
              <div class="th">单价</div>
              <div class="th num-th">个数</div>
              <div class="th">小计</div>
              <div class="th">操作</div>
            </div>
          </div>
          <!-- 身体 -->
          <div class="tbody">
            <div class="tr " v-for="item in fruitList" :key="item.id" :class="{active:item.isChecked}">
              <div class="td"><input type="checkbox" v-model="item.isChecked" /></div>
              <div class="td"><img  :src="item.icon" alt="" /></div>
              <div class="td">{{item.price}}</div>
              <div class="td">
                <div class="my-input-number">
                  <button class="decrease"
                  :disabled="item.num<=1"
                  @click="item.num--"> - </button>
                  <span class="my-input__inner">{{item.num}}</span>
                  <button class="increase" @click="item.num++"> + </button>
                </div>
              </div>
              <div class="td">{{item.num*item.price}}</div>
              <div class="td"><button @click="del(item.id)">删除</button></div>
            </div>

            <!-- <div class="tr">
              <div class="td"><input type="checkbox"/></div>
              <div class="td"><img src="http://autumnfish.cn/static/荔枝.png" alt="" /></div>
              <div class="td">7</div>
              <div class="td">
                <div class="my-input-number">
                  <button class="decrease"> - </button>
                  <span class="my-input__inner">1</span>
                  <button class="increase" > + </button>
                </div>
              </div>
              <div class="td">{{item.num*item.price}}</div>
              <div class="td"><button>删除</button></div>
            </div> -->
          </div>
        </div>
        <!-- 底部 -->
        <div class="bottom">
          <!-- 全选 -->
          <label class="check-all">
            <input type="checkbox" v-model="isAll" />
            全选
          </label>
          <div class="right-box">
            <!-- 所有商品总价 -->
            <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">{{total}}</span></span>
            <!-- 结算按钮 -->
            <button class="pay">结算( {{totalPay}})</button>
          </div>
        </div>
      </div>
      <!-- 空车 -->
      <div class="empty" v-else>🛒空空如也</div>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
      const defaultList=[
      {
              id: 1,
              icon: './img/火龙果.png',
              isChecked: true,
              num: 2,
              price: 6,
            },
            {
              id: 2,
              icon: './img/荔枝.png',
              isChecked: false,
              num: 7,
              price: 20,
            },
            {
              id: 3,
              icon: './img/榴莲.png',
              isChecked: false,
              num: 3,
              price: 40,
            },
            {
              id: 4,
              icon: './img/鸭梨.png',
              isChecked: true,
              num: 10,
              price: 3,
            },
            {
              id: 5,
              icon: './img/樱桃.png',
              isChecked: false,
              num: 20,
              price: 34,
            },
      ]
      const app = new Vue({
        el: '#app',
        data: {
           // 水果列表    优先读取本地存储数据，如果没有就使用默认数据
          fruitList: [
          JSON.parse(localStorage.getItem('fruitList')||defaultList)
          ],
        },
        methods:{
          del(id){
            this.fruitList=this.fruitList.filter(v=v.id!==id)
          }
        },
        computed:{
          isAll:{
            get(){
              return this.fruitList.every(v=>v.isChecked)
            },
            set(value){
               this.fruitList.forEach(v => v.isChecked=value);
            }
          },
          checkedList(){
            return this.fruitList.filter(item=>item.isChecked)
          },
          total(){
            // return this.fruitList.reduce((sum,item)=>{
            //   if(item.isChecked){
            //     return sum+item.num*item.price
            //   }else{
            //     return sum
            //   }
            // })

            // return this.fruitList.filter(item=>item.isChecked).reduce((sum,item)=>sum+item.num*item.price,0)
            return this.checkedList.reduce((sum,item)=>sum+item.num*item.price,0)
          },
          totalPay(){
            // return this.fruitList.reduce((sum,item)=>{
            //   if(item.isChecked){
            //     return sum+item.num
            //   }else{
            //     return sum
            //   }
            // })
            return this.checkedList.reduce((sum,item)=>sum+item.num,0)
          }
        },
        watch:{
          fruitList:{
            handler(){
              localStorage.setItem('fruitList',JSON.stringify(this.fruitList))
            }
          }
        }

      })
    </script>
  </body>
</html>
